The new near-field approach for microwave tomography of absorbing media

Yakubov, V. P.; Shipilov, S. É.; Mironchev, Aleksandr; Klokov, Andrey; Zapasnoy, A. S.

doi:10.1063/1.5108585

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…Previously, the authors proposed a new approach to the probing of strongly absorbing media [ 25 ]. The emitter (antenna) has two spatially distributed zones near it—near and far.…”

Section: Methodsmentioning

confidence: 99%

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Theoretical Simulation of the Near-Field Probe for Non-Invasive Measurements on Planar Layers with Biological Characteristics

et al. 2020

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The article presents the design of the near-field probe, which is a combined emitter (a combination of a symmetric dipole and an annular frame). The design of the probe allows forming a prolonged zone of the near-field. This effect can be used for in-depth penetration of the field in media with high absorption, without loss of information. Particular attention in this article is given to a detailed study of the interaction of the field created by this probe on plane-layered biological media. A theoretical analysis of the interaction of the electromagnetic field was carried out in a wide frequency band with a model plane-layer biological medium containing blood vessels of shallow depth using the proposed probe design. Conclusions are drawn about the depth of penetration of a useful signal into different media-analogs of biological tissue. This study is necessary to consider the possibility of using this probe for non-invasive measurements of blood glucose concentration. The studies were carried out using numerical simulation in the CST (Computer Simulation Technology) Microwave Studio environment. All biological tissues were simulated over a wide frequency range from 10 MHz to 10 GHz.

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“…Previously, the authors proposed a new approach to the probing of strongly absorbing media [ 25 ]. The emitter (antenna) has two spatially distributed zones near it—near and far.…”

Section: Methodsmentioning

confidence: 99%

“…The size of the near zone depends on the frequency and refractive index of the medium. More details on this theory can be found in the article [ 25 ].…”

Section: Methodsmentioning

confidence: 99%

Theoretical Simulation of the Near-Field Probe for Non-Invasive Measurements on Planar Layers with Biological Characteristics

et al. 2020

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“…It should be noted that the ideological basis of our work was provided by pioneer research [17] in which the new concept of microwave tomography of absorbing media was proposed. Within the framework of this concept, essential changes in the near-field phase state of the probe in the vicinity of the so-called causal surface are effectively used for sensing of the medium.…”

Section: Introductionmentioning

confidence: 99%

Application of Broadband Microwave Near-Field Sensors for Glucose Monitoring in Biological Media

et al. 2021

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The paper presents results of numerical simulation and experimental testing of a microwave sensor for non-invasive glucose monitoring. The sensor represents a conical horn with a conical conductor inside expanding toward the horn aperture. Such a sensor has a significantly wider passband in comparison with sensors of other designs. It is essential that the sensor geometry provides formation of an extended near-field zone with high electric field strength near the sensor aperture. A clear relationship between the dielectric permittivity of the phantom biological tissue and the frequency dependence of the parameter S11 of the sensor is observed at frequencies in the range from 1.4 to 1.7 GHz. This circumstance can be used to develop a procedure for measuring the glucose level in blood that correlates with the parameter S11 of the sensor. From the viewpoint of monitoring of the glucose content in blood, the most convenient body sensor location is on the hands or feet, in particular, wrists.

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Confined In‐Situ Encapsulation of Co/C Composites with Increased Heterogeneous Interface Polarization for Enhanced Electromagnetic Performance

Qiu,

Liang,

Xiang

et al. 2023

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It is an urgent problem to realize reliable microwave absorption materials (MAMs) with low density. To address this issue, a series of controlled experiments w ere carried out, which indicated that the tubular structure enables excellent microwave absorption properties with a lower powder filling rate. This performance is attributable to the combined dielectric and magnetic loss mechanisms provided by Co/C and the interface polarization facilitated by multiple heterogeneous interfaces. Particularly, Co@C nanotubes, benefiting from the enhanced heterointerface polarization due to their abundant specific surface area and the reduced electron migration barrier induced by their 1D stacked structure, effectively achieved a dual enhancement of dielectric loss and polarization loss at lower powder filling ratios. Furthermore, the magnetic coupling effect of magnetic nanoparticle arrays in tubular structures is demonstrated by micromagnetic simulation, which have been few reported elsewhere. These propertied enable Co@C nanotubes to achieve minimum reflection loss and maximum effective absorption broadband values of 61.0 dB and 5.5 GHz, respectively, with a powder filling ratio of 20 wt% and a thickness of 1.94 mm. This study reveals the significance of designing 1D structures in reducing powder filling ratio and matching thickness, providing valuable insights for developing MAMs with different microstructures.

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The new near-field approach for microwave tomography of absorbing media

Cited by 5 publications

References 23 publications

Theoretical Simulation of the Near-Field Probe for Non-Invasive Measurements on Planar Layers with Biological Characteristics

Theoretical Simulation of the Near-Field Probe for Non-Invasive Measurements on Planar Layers with Biological Characteristics

Application of Broadband Microwave Near-Field Sensors for Glucose Monitoring in Biological Media

Confined In‐Situ Encapsulation of Co/C Composites with Increased Heterogeneous Interface Polarization for Enhanced Electromagnetic Performance

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